Microsoft probing if DeepSeek-linked group improperly obtained OpenAI data

Microsoft Corp. and OpenAI are investigating whether data output from OpenAI’s technology was obtained in an unauthorised manner by a group linked to Chinese artificial intelligence startup DeepSeek, according to people familiar with the matter.

Microsoft’s security researchers in the fall observed individuals they believe may be linked to DeepSeek exfiltrating a large amount of data using the OpenAI application programming interface, or API, said the people, who asked not to be identified because the matter is confidential.